Final Drive S1KRR 2011 Vs. 2012. Why the difference? - BMW S1000RR Forums: BMW Sportbike Forum
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Old 11-09-2012, 08:14 PM   #1 (permalink)
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Default Final Drive S1KRR 2011 Vs. 2012. Why the difference?

Hello everyone:

I have a S1KRR/2011. Another day, checking an owner's manual of the model 2012, I see with surprise that the final drive relation of this motorbike is 17/45, that of my motorbike is of 17/44. Other relations, gearbox and primary transmission, they are identical and of course the measurement of the tire also. The truth does not seem to me logical the change of relation between one year and other, according to my calculations the model 2012 is 2,27 % shorter. Said otherwise to 14200 rpm 2011 runs to 306 Km/h and 2012 scarcely 300 km/h. What did they want to do?. For modest me to understand, the change is ridiculous. To cheat that 2012 accelerates more? It's infantile.
Thanks for the attention
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Old 11-09-2012, 08:45 PM   #2 (permalink)
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Be happy, you have the higher top speed and the lighter (smaller) rear sprocket. I know the newer model has a 200 rear tire so the gearing change makes sense, but I didn't know that the 2012 was geared differently too. Maybe they ran out of 44 sprockets.
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Old 11-09-2012, 09:08 PM   #3 (permalink)
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Also the 2012 had steering head off center ? % can't remember by how much. There were other minor items changed as well. Although I have not ridden a 12, had the chance at track day but just enjoyed my 10 why change, the upper speed guys said they could tell a difference. Honestly other than that sprocket for more low end torque I think the difference is for the more skilled track rider.
My .02 anyway.


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Old 11-09-2012, 09:27 PM   #4 (permalink)
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Quote:
Originally Posted by skapan View Post
Be happy, you have the higher top speed and the lighter (smaller) rear sprocket. I know the newer model has a 200 rear tire so the gearing change makes sense, but I didn't know that the 2012 was geared differently too. Maybe they ran out of 44 sprockets.
Thanks for your comments. I wasn't knowing that 2013 will bring 200. I do not put my motorbike in circuits, mine is freeways and supported speed. Therefore trying to diminish the diet of the engine I lowered three teeth of rear spocket and I manage to run to 319/320 km/h to only 13.800 rpm. Here in my country several engines have broken for court of valves and cams and the followers have deteriorated turning to +14.000 rpm during 3 4 minutes.
Forgives my english
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Old 11-09-2012, 11:25 PM   #5 (permalink)
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Quote:
Originally Posted by skapan View Post
Be happy, you have the higher top speed and the lighter (smaller) rear sprocket. I know the newer model has a 200 rear tire so the gearing change makes sense, but I didn't know that the 2012 was geared differently too. Maybe they ran out of 44 sprockets.
So the 2013 S1K will have the 200 rear tire? I knew about the HP but did not consider the regular stock '13 to have a 200.
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Old 11-10-2012, 02:49 AM   #6 (permalink)
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Not sure where this came from, the 2013 has a 190 rear tire. The change in gear ratio was to give the bike slightly more midrange acceleration.
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Old 11-10-2012, 11:02 AM   #7 (permalink)
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I was thinking HP4 when I said 200 tire - "new model". Should have been more specific.
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